【作者】 盛兴旺； 廖君璨； 郑纬奇； 郭舜哲； 徐弘毅；

【Author】 SHENG Xing-wang;LIAO Jun-can;ZHENG Wei-qi;GUO Shun-zhe;XU Hong-yi;School of Civil Engineering,Central South University;National Engineering Research Center of High-speed Railway Construction Technology;Hunan Provincial Communications Planning,Survey and Design Institute Co.,Ltd;

【机构】 中南大学土木工程学院； 高速铁路建造技术国家工程研究中心； 湖南省交通规划勘察设计院有限公司；

【摘要】 结构处于日照辐射环境中,产生时变不均匀温度作用。复杂结构体系时变不均匀温度作用的影响不可忽略,时变不均匀温度作用下拱塔斜拉桥-无砟轨道体系变形适应性亟待开展相关研究。由此,以拱塔斜拉桥-CRTSⅢ型板式无砟轨道体系为工程背景,基于实时阴影技术,研究日照辐射下复杂桥-轨体系的时变温度分布,确定桥-轨体系不均匀温度作用的计算模式。进而采用热-结构耦合分析技术,对复杂结构的时变不均匀温度作用开展精细化分析,探讨复杂桥-轨体系的变形适应性。结果表明:日照引起的时变不均匀温度是引起轨道隔离层层间离缝的主要原因。日照辐射致结构不均匀温度作用下,使用体刚度为0.05N/mm3的橡胶隔离层时,无砟轨道结构层间离缝的最大值相比0.1 N/mm~3的橡胶隔离层减小了19%,铺设较小体刚度的橡胶隔离层可以有效减少时变不均匀温度引起斜拉桥-无砟轨道层间离缝。研究结果可为同类型大跨度桥梁应用无砟轨道提供参考依据。更多还原

【Abstract】 When the structure is exposed to solar radiation,time-varying non-uniform temperature effects occur.However,the effects of time-varying non-uniform temperature on complex structural systems cannot be ignored,the deformation adaptability of arch-tower cable-stayed bridge ballastless track system under time-varying nonuniform temperature therefore needs to be further studied.In this work,the time-varying temperature distribution of complex bridge rail system under solar radiation is determined,and the calculation formula of uneven temperature effect of bridge rail system is researched,based on the real-time shadow technology,with the archtower cable-stayed bridge-CRTSⅢ plate ballastless track system as the engineering background.And then,the thermal-structure coupling analysis technique is employed to carry out a refined analysis of the time-varying nonuniform temperature effects on complex structures and to explore the deformation adaptability of complex bridgetrack systems.The results show that,time-varying non-uniform temperature temperatures due to sunlight are the main cause of interlayer departures in the track isolation layer.The maximum value of the gap between the layers of the ballastless track structure is reduced by 19% when using a rubber isolation layer with a cube stiffness of 0.05N/mm3 compared to a rubber isolation layer of 0.1N/mm~3 under the effect of non-uniform temperature of the structure due to sunlight radiation.That’s to say,the use of the rubber isolation layer with lower cube stiffness can effectively reduce time-varying non-uniform temperature temperature-induced interlayer departures in ballastless track of cable-stayed bridges.The results of this work can provide a reference for the application of ballastless track on large span bridges of the same type.更多还原